JP2000185356A - Dichroic skin automobile interior decorative article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dichroic skin automobile interior decorative article capable of reducing a manufacturing man-hour and a using amount of a skin material. SOLUTION: The automobile interior decorative article comprises an interior decorative article body (base material layer) and a design skin. The design skin has separately molded first and second skins of dichroic type. In this case, the first skin 114 is molded of a design sheet having a barrier layer 122 on its rear surface side, and the second skin 116 is formed of a slush molding. The skin 114 is fusion bonded integrally with an interior decorative article body 118 of an injection molding through the layer 122, and the skin 116 is integrated with the body 118 and an injection molding soft foamed layer 120.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-color type comprising an interior product main body (base layer) and a design skin, and the design skin is composed of a first skin and a second skin molded separately. Automobile interior parts. The present invention is suitable for automobile interior parts that require high designability such as instrument panels, glob boxes, registers, and handle columns, as well as good tactile sensation (feel).

2. Description of the Related Art Here, an instrument panel (hereinafter referred to as "instrument panel") will be mainly described as an example.

[0003]

2. Description of the Related Art FIGS. 1 and 2 show an example of an instrument panel 12 having a design skin 10 of a two-color type.

The design skin 10 comprises a first skin 14 mainly forming the upper side and a second skin 16 mainly forming the lower side. For example, the first skin 14 is brown and the second skin 16 is gray. Color.

As an instrument panel having such a configuration, there has been one having a cross-sectional configuration as shown in FIG.

[0006] A soft foam layer 20 is provided between the design skin 10 and the instrument panel main body 18 to provide cushioning to the design skin 10. The design skin 10 is formed by welding the joining end faces of the first skin 14 and the second skin 16 slush-molded separately from each other using a plastisol such as PVC or urethane TPE, and the instrument panel body 18 includes: PP (F) (fiber reinforced PP)
The soft foamed layer 20 is formed by injection molding a soft foamed material between the design skin 10 and the instrument panel body 12 as inserts.

Here, the reason why the slush molded product is used is that the slush molded product is excellent in stain resistance, tactile sensation and the like.

[0008]

However, in the case of the two-color skin instrument panel having the above structure, the first skin slash molding is performed.
Second skin slush molding → welding of the first skin and the second skin → molding of the instrument panel → injection molding of the soft foam layer, as well as the number of manufacturing steps is increased, and it is difficult to stably obtain thin skin with relatively small thickness. The amount of material used also increased.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a two-color skin automobile interior part capable of reducing the number of manufacturing steps and the amount of skin material used.

[0010]

Means for Solving the Problems In order to solve the above problems, the inventors of the present invention have intensively developed a first skin (upper side skin) for automobile interior parts such as instrument panels.
Found that the occupant's hands and parts of the body were less likely to touch the second epidermis (lower epidermis) and did not require the level of stain resistance and tactile sensation required for the second epidermis. We arrived at a two-color skin car interior product having the following configuration.

The two-color skin automobile interior part of the present invention comprises an automobile interior part main body (base layer) and a design skin, and the design skin is composed of a separately molded first skin and a second skin. In an automobile interior product that is a color type, the first skin is formed of a design sheet having a barrier layer on the back surface side, the second skin is formed of a slash molded product, and the first skin is an injection molded product. The interior part is fused and integrated with the interior part via a barrier layer, and the second skin is integrated with the interior part body via an injection molded foam layer.

In the above configuration, it is desirable that the first skin is a vacuum-formed product from the viewpoint of reducing the number of manufacturing steps.

In addition, it is desirable from the viewpoint of PVC removal that the second skin is slush-molded with a TPU-based plastisol.

Further, it is desirable from the viewpoint of productivity that the injection-molded flexible foam layer is formed by reaction injection molding.

[0015]

The two-color skin automobile interior part of the present invention can reduce the number of manufacturing steps and the amount of skin material used by the above-mentioned structure.

In other words, the man-hours required for manufacturing the automobile interior part of the present invention are four steps of first skin molding → first skin embedded instrument panel body molding → second skin slush molding → soft foam layer injection molding. One skin slush molding → Second skin slash molding → Welding of the first and second skins → Instrument panel body molding → Soft foam layer injection molding,
The number of steps can be reduced as compared with the case where the five steps are required. When replacing one of a pair of slash molding, which is time-consuming and needs to be formed thicker for wall thickness stability, with vacuum molding, it is possible to further reduce the man-hours, and also to expect a reduction in the skin material. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where an embodiment of the present invention is applied to the above-mentioned instrument panel will be described below with reference to the drawings. It should be noted that the figure symbols of the present embodiment are three-digit numbers in the hundreds, and the same two-digit numbers are used for the parts corresponding to the above-described example.

(1) The instrument panel 112 of the present embodiment comprises an instrument panel main body (interior product main body) (base layer) 118 and the design skin 1
The design skin 110 is of a two-color type including a first skin 114 and a second skin 116 which are separately formed. The coloring at this time is, for example, the first skin 14 is a brown color and the second skin 16 is a gray color, as in the above-described example.

(2) In the above, the instrument panel body 118
Is usually formed of a hard thermoplastic resin. The rigid thermoplastic resin is generally a plastic material containing a reinforcing filler and has a flexural modulus of about 20,000 to 30,000 kgf / cm ² (1) in order to secure shape retention and low-temperature resistance.
960-2940 MPa), desirably 23000-
It is set to 27000 kgf / cm ² (2254 to 2646 MPa). Specifically, from the viewpoint of lightness and the like, a fiber-reinforced olefin-based resin, more specifically, PP (F) can be suitably used. The thickness of the instrument panel body 118 is usually 2
４4 mm.

Although not shown, when the instrument panel body is of an airbag built-in type, the lid portion of the airbag may be formed of a thermoplastic elastomer from the viewpoint of securing hinge characteristics and the like. As the thermoplastic elastomer, when the instrument panel body 118 is made of fiber-reinforced PP, an olefin-based TPE (TP
O) or styrene-based TPE (SBS).

As the TPO, a blend type, a polymerization type, a partially cross-linked blend type, a completely cross-linked blend type, a halogen-modified polyolefin, a PP / PE alloy and the like can be used.

The SBS includes styrene / ethylene / butylene block copolymer (SEBS), styrene / isoprene block copolymer (SIS), styrene / butadiene block copolymer (SBS),
Styrene / ethylene / propylene block copolymer (SEPS), hydrogenated SBR and the like can be used.

(3) In the present embodiment, the first skin 114 is formed by a vacuum formed product of a design sheet having the barrier layer 122 on the back surface side. As the first skin 114, a design sheet that is not hot-pressed or formed may be used in some cases.

In the illustrated example, the design sheet 114 has a three-layer structure of the barrier layer 122, the foam layer 124, and the skin layer 126, but may have a two-layer structure of the barrier layer 122 and the skin layer 126. Since the upper side (upper side) of the instrument panel 112 is a portion where the limbs and other parts of the body of the occupant rarely come into contact with each other, there is little problem even if the design sheet has a two-layer structure and has a somewhat hard tactile sensation.

The barrier layer 122 is provided to protect the skin layer 126 and the foam layer 124 from the pressure and heat of the injection material when the instrument panel body (base layer) 118 is formed by injection molding. is there.

The barrier layer 122 is made of a material that can be thermally fused with a hard thermoplastic resin and / or a thermoplastic elastomer forming the instrument panel body 118. That is, the barrier layer 122 is made of a non-polar material and a polar material, with the respective base layer materials corresponding to the non-polar material and the polar material, respectively. Although not shown, when the instrument panel body is of an airbag built-in type, the lid of the airbag may be molded of a thermoplastic elastomer.

For example, if the instrument panel body 118 is PP (F)
When the material for forming the cover base material layer (not shown) is made of TPO, the barrier layer 122 is made of the same non-polar material, TPO.
PO or SBS.

The above-mentioned TPO and SBS are of the type exemplified by the lid base material layer, and have a high flexural modulus, ie, 3500 to 15000 kgf / cm ² (343 to 1470).
MPa), desirably 5,000 to 10,000 kgf / cm ²
(490-980 MPa) is used.

The thickness of the barrier layer 122 is 0.8 mm.
Above, usually 0.8 to 1.5 mm, desirably 0.9 to 1.5
1.2 mm. If it is less than 0.8 mm, the function of the barrier layer,
In the injection molding of the base material layer 22a, the effect of protecting the foamed layer 124 from material heat and material pressure is hardly exerted.

The foam layer 124 gives the instrument panel 112 a soft feeling. When the barrier layer 122 is made of a non-polar material, the foam layer 124 is formed from the viewpoint of adhesiveness and the like.
P, foamed PE and the like are desirable.

The thickness of the foam layer 124 is 1.5 mm
As described above, the thickness is usually 1.5 to 4 mm, preferably 2 to 3 mm. If the thickness is less than 1.5 mm, the foam layer 124 does not easily exert a cushioning effect.

The skin layer 126 has a function of protecting the surface of the instrument panel 112 and is usually made of the above-mentioned TPO or SB.
From the viewpoint that S can be used and the soft feeling of the foamed layer 124 is not impaired, the bending elastic modulus is naturally set to the instrument panel body (base layer) 1
18 or less, that is, flexural modulus of 200 to 800 kg
f / cm ² (19.6-39.2 MPa), preferably 30
A material having a pressure of 0 to 600 kgf / cm ² (19.6 to 39.2 MPa) is used.

The thickness of the skin layer 126 is 0.4 mm.
As described above, usually, 0.4 to 1 mm, preferably 0.5 to 0.8
mm. If it is less than 0.4 mm, it becomes difficult to ensure oil resistance, scratch resistance, and the like on the surface of the instrument panel 112.

(4) In the present embodiment, the second skin 116
Are integrated with the instrument panel body 118 via the injection-molded soft foam layer 120. At this time, the second epidermis 116
Usually, slash skin is used. This slash skin 11
6 is 0.7 to 1.3 mm, preferably 0.9 to
1.2 mm. If it is too thick, the amount of material used increases and the number of molding steps also increases. On the other hand, if it is too thin, it will be difficult to satisfy scratch resistance, heat aging resistance, and light resistance.

As a plastisol for slush molding which is a material for forming the slash skin 116, PVC is used.
System, but from the viewpoint of de-PVC, urethane T
PE-based materials are desirable.

The injection molded foam layer 120 has a thickness of 5
10 to 10 mm, desirably 7 to 9 mmmm, density: 0.1 to 0.
3 g / cm ³ . As a mode of injection molding, usually, reaction injection molding (RIM) is used.
ng). As the RIM molding material, a flexible foamed polyurethane RIM material is used.

(5) Next, a method for manufacturing an instrument panel will be described. The present embodiment includes the following steps.

Design sheet 114 having barrier layer 122
Is vacuum-formed using a vacuum-forming die (not shown).

The instrument panel body 118 is injection-molded using the vacuum-formed first skin 114 as an insert to form an instrument panel body 119 with a first skin. At this time, as the material to be used, the aforementioned hard thermoplastic resin and thermoplastic elastomer are used.

In parallel with or before or after the above, the second skin 116 is prepared by slush molding. As the material used at this time, the above-mentioned TPU-based plastisol can be used.

Using a soft foam material between the instrument panel body 118 and the second skin 116, using the interior product body 119 with the first skin and the second slash-molded second skin 116 as inserts, as shown in FIG. Injection molding is performed using a mold 128. At this time, the mode of injection molding is usually polyurethane RIM as described above. Note that 1
Reference numeral 30 denotes an injection gate.

The instrument panel 112 manufactured in this manner is used by being assembled to an actual vehicle by a conventional method. At this time, the upper side of the instrument panel 112 is formed of a three-layer or two-layer design sheet 114 whose touch feeling is slightly inferior to that of the slash skin, while the instrument panel upper side is formed of a passenger's limbs and other parts of the body. Seldom touched, causing little problem.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outline of an instrument panel to which the present invention is applied.

FIG. 2 is a model cross-sectional view of a conventional example taken along a line 2-2 in FIG. 1;

FIG. 3 is a partial sectional view of the embodiment of the present invention.

FIG. 4 is a schematic mold diagram in a final step of manufacturing an instrument panel having the cross section of FIG.

[Explanation of symbols]

 10, 110: design skin 12, 112: instrument panel (instrument panel) 14: first skin 114: first skin (design sheet) 16: second skin 116: second skin (slash skin) 18, 118: instrument panel body (Interior body) (Base layer) 119 ... Instrument panel body with first skin 20, 120 ... Soft foam layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60K 37/00 B60K 37/00 A B60R 13/02 B60R 13/02 Z // B29K 75:00 B29L 31: 58 (72) Inventor Hikaru Ando 1 Ogataai Nagahata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (72) Inventor Akio Nakano 1 Ogatachi Ogatai, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Toyoda Gosei Co., Ltd. Terms (Reference) 3D023 BA01 BB25 BC00 BD29 BD30 BE04 BE06 BE14 BE17 BE31 3D044 BA00 BA03 BA07 BA11 BB01 BC03 BC04 BD04 4F206 AA31 AC03 AC06 AG03 AG20 AH26 JA07 JB14 JB24 JF05 4F213 AA31 AC03 AC06 AG03 WA05 WA03 WA03 WA03 WB28

Claims (5)

[Claims] 1. An automobile interior product comprising a interior product main body (base layer) and a design skin, wherein the design skin is a two-color type consisting of a separately molded first skin and a second skin. The first skin is formed of a design sheet having a barrier layer on the back side, and the second skin is formed of a slush molded product, and the first skin is an interior molded product body and a barrier layer that are injection molded products. A two-color skin automobile interior part, wherein the second skin is integrated with the interior part body via an injection-molded soft foam layer. 2. The interior part of a two-color skin automobile according to claim 1, wherein the first skin is a vacuum molded product. 3. The two-color skin automobile interior part according to claim 1, wherein the second skin is formed by slash molding with a TPU-based plastisol. 4. The interior part of a two-color skin automobile according to claim 3, wherein said injection molded soft foam layer is formed by reaction injection molding. 5. The injection molded soft foam layer is formed by reaction injection molding.
The two-color skin automotive interior described.